Demonstrate crash in brininsertcleanup during logical replication.

A cross-partition update crashes if the subscriber's table has
a BRIN index.  This is easily demonstrated by adding such an
index to 013_partition.pl.  I'm not sure if we actually want
to include this in the final patchset, so it's a separate patch
for now.

Bug: #18815
Reported-by: Sergey Belyashov <sergey.belyashov@gmail.com>
Discussion: https://postgr.es/m/18815-2a0407cc7f40b327@postgresql.org
Backpatch-through: TBD

Author: tglsfdc

src/test/subscription/t/013_partition.pl

@@ -49,6 +49,9 @@
 $node_subscriber1->safe_psql('postgres',
 	"CREATE TABLE tab1 (c text, a int PRIMARY KEY, b text) PARTITION BY LIST (a)"
 );
+$node_subscriber1->safe_psql('postgres',
+	"CREATE INDEX ON tab1 USING brin (c)"
+);
 $node_subscriber1->safe_psql('postgres',
 	"CREATE TABLE tab1_1 (b text, c text DEFAULT 'sub1_tab1', a int NOT NULL)"
 );